ACTION CAMS AND LOW-COST MULTI-FREQUENCY ANTENNAS FOR GNSS ASSISTED PHOTOGRAMMETRIC APPLICATIONS WITHOUT GROUND CONTROL POINTS

Abstract. In civil, architectural and environmental fields photogrammetry is one of the most common solutions for deriving geometric information about many kind objects interest. Photogrammetric surveys suffer need ground control points (GCPs), well distributed over survey area, to scale georeference produced 3D data. The placement GCPs both time-consuming sometimes infeasible because constraints, such as vegetation on river sides. For aerial with unmanned vehicles (UAV), several studies have been proposed use UAV GNSS antenna reduce or eliminate GCPs. This technique, called GNSS-aided photogrammetry, has little explored terrestrial applications despite its potential in reducing surveying time, integrating surveying. gap partly caused by high cost topographic-grade GNSS, but recent years market offered receivers, ublox ZED-F9P, which can achieve accuracy at low cost. this work we propose a simple fast methodology photogrammetric using low-cost image sensors. final aim create general procedure minimize costs derive scaled georeferenced without